TDA2003 with a 555 question

Discussion in 'The Projects Forum' started by wretan, Mar 18, 2009.

  1. wretan

    Thread Starter New Member

    Mar 18, 2009
    6
    0
    Hello all! Nice forum! :)

    I´m working on a robot lawnmover, have som problems with the buried wire fence. Found one simple circuit with a 555 as driver but I can´t understand how they use the TDA2003 as amplifier, actually I´m not sure that it is a TDA2003 used?? It just says 2003 (but 16 pin??)

    Can anyone please understand this?

    here is the pdf of the wirefence
    http://www.robotshop.se/micro/pdf/rob_sch1.pdf

    Best regards
    wretan
     
  2. bertus

    Administrator

    Apr 5, 2008
    15,648
    2,347
    Hello,

    I think they use the ULN2003, A multiple buffer.

    Greetings,
    Bertus
     
  3. wretan

    Thread Starter New Member

    Mar 18, 2009
    6
    0
    Hi bertus and thank you for the reply!
    I have searched the web and can´t find what a multiple buffer does (in this application) ?

    I´m a n00bie into digital circuits but it someway seemed resonable to have some kind of amplifier to get the signal high enough to get through a big garden :rolleyes:

    Thanks once again!
    /wretan
     
  4. bertus

    Administrator

    Apr 5, 2008
    15,648
    2,347
    Hello,

    Here is the datasheet.
    It consists of 7 darlington transistors on a DIL housing.

    Greetings,
    Bertus
     
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